I just released a new browser extension, called Wii Shop Channel Music! It plays the iconic Wii Shop Channel theme in the background when you visit a shopping website. Some supported sites include Amazon, eBay, Best Buy, and Google Shopping. The music also only plays when the site is in the currently-active tab.
The extension is currently live for Firefox, and the Chrome version is in the approval process. Just like my other projects, it’s fully open-source, and you can look at the code on GitHub.